-al a-a a-b aaa aab aal aan aar ab- aba abb abl abn abr al- ala alb all aln alr an- ana anb anl ann anr ar- ara arb arl arn arr baa bab bal ban bar bba bbb bbl bbn bbr bla blb bll bln blr bna bnb bnl bnn bnr bra brb brl brn brr la- laa lab lal lan lar lba lbb lbl lbr lla llb lll lln llr lna lnb lnl lnn lnr lra lrb lrn lrr naa nab nal nan nar nba nbb nbl nbn nbr nla nlb nll nln nlr nna nnb nnl nnn nra nrb nrl nrn nrr ra- raa rab ral ran rar rba rbb rbl rbn rbr rla rll rln rlr rna rnb rnn rnr rra rrb rrl rrn rrr